mirror of
https://github.com/dborth/fceugx.git
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120 lines
2.6 KiB
C++
120 lines
2.6 KiB
C++
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2006 CaH4e3
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "mapinc.h"
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static uint16 latchea;
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static uint8 latched;
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static uint8 *WRAM=NULL;
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static uint32 WRAMSIZE;
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static SFORMAT StateRegs[]=
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{
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{&latchea, 2, "LATCHEA"},
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{&latched, 1, "LATCHED"},
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{0}
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};
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static void Sync(void)
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{
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int i;
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setmirror(((latched>>6)&1)^1);
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switch(latchea)
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{
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case 0x8000:
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for(i=0;i<4;i++)
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setprg8(0x8000+(i<<13),(((latched&0x7F)<<1)+i)^(latched>>7));
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break;
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case 0x8002:
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for(i=0;i<4;i++)
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setprg8(0x8000+(i<<13),((latched&0x7F)<<1)+(latched>>7));
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break;
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case 0x8001:
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case 0x8003:
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for(i=0;i<4;i++)
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{
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unsigned int b;
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b=latched&0x7F;
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if(i>=2 && !(latchea&0x2))
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i=0x7F;
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setprg8(0x8000+(i<<13),(i&1)+((b<<1)^(latched>>7)));
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}
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break;
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}
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}
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static DECLFW(M15Write)
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{
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latchea=A;
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latched=V;
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Sync();
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}
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static void StateRestore(int version)
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{
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Sync();
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}
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static void M15Power(void)
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{
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latchea=0x8000;
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latched=0;
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setchr8(0);
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setprg8r(0x10,0x6000,0);
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SetReadHandler(0x6000,0x7FFF,CartBR);
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SetWriteHandler(0x6000,0x7FFF,CartBW);
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SetWriteHandler(0x8000,0xFFFF,M15Write);
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SetReadHandler(0x8000,0xFFFF,CartBR);
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Sync();
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}
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static void M15Reset(void)
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{
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latchea=0x8000;
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latched=0;
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Sync();
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}
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static void M15Close(void)
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{
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if(WRAM)
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FCEU_gfree(WRAM);
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WRAM=NULL;
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}
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void Mapper15_Init(CartInfo *info)
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{
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info->Power=M15Power;
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info->Reset=M15Reset;
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info->Close=M15Close;
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GameStateRestore=StateRestore;
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WRAMSIZE=8192;
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WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);
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SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);
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if(info->battery)
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{
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info->SaveGame[0]=WRAM;
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info->SaveGameLen[0]=WRAMSIZE;
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}
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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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AddExState(&StateRegs, ~0, 0, 0);
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}
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